A rectangular floor that is 10 feet wide and 17 feet long is tiled with 170 one-foot square tiles. A bug walks from one corner to the opposite corner in a straight line. Including the first and the last tile, how many tiles does the bug visit?
Use Pythagoras's Theorem:
Bug's Path^2 =10^2 + 17^2
=100 + 289
=19.72 - or ~20 tiles that the Bug crosses.